HYDRAULIC CONTROL CIRCUIT OF VEHICULAR SYNCHROMESH TRANSMISSION

PROBLEM TO BE SOLVED: To provide a hydraulic control circuit 80 of a vehicular synchromesh transmission 16 capable of generating a hydraulic pressure of an appropriate value output to a shift cylinder 78 without delay when synchronizing operation of a synchromesh clutch 48 is started. SOLUTION: The hydraulic control circuit of the vehicular synchromesh transmission includes a linear solenoid valve 94 that supplies a hydraulic pressure until one of a plurality of synchromesh clutches 48 is placed in a neutral condition, and shuts off the supply before the synchronizing operation is started, and an accumulator 100 provided in a first oil channel 98 between the linear solenoid valve 94 and the shift cylinder 78. The accumulator 100 stores a certain amount of hydraulic fluid while accumulating a hydraulic pressure, and functions as a hydraulic pressure source after the linear solenoid valve 94 is shut off. The hydraulic pressure supplied from the accumulator 100 after the shutoff is reduced in accordance with the amount of the hydraulic fluid supplied from the accumulator 100, and the hydraulic pressure output to the shift cylinder 78 is appropriately generated without delay when the synchronizing operation of the synchromesh clutch 48 is started. COPYRIGHT: (C)2009,JPO&INPIT